The next decade could see significant steps towards eradicating viruses which threaten the lives of millions of people worldwide. Major progress has been made towards a cure for hepatitis C, but at $84,000 for a course of treatment, will the cost of the drugs stand in the way of a global roll-out? And with the high cost and risks of toxicity and drug resistance making anti-retrovirals a less than ideal long-term solution for HIV patients, what breakthroughs are giving scientists hope in their efforts to find a cure for the virus?